In gamma-ray astronomy, gamma-ray bursts (GRBs) are immensely energetic explosions that have been observed in distant galaxies, being the brightest and most extreme explosive events in the entire universe,[1][2][3] as NASA describes the bursts as the "most powerful class of explosions in the universe".[4] They are the most energetic and luminous electromagnetic events since the Big Bang.[5][6] Gamma-ray bursts can last from ten milliseconds to several hours.[7][8] After the initial flash of gamma rays, an "afterglow" is emitted, which is longer lived and usually emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).[9]

The intense radiation of most observed GRBs is thought to be released during a supernova or superluminous supernova as a high-mass star implodes to form a neutron star or a black hole. A subclass of GRBs appears to originate from the merger of binary neutron stars.[10]

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Prototaxites /ˌproʊtoʊˈtæksɪti:z/ is a genus of terrestrial fossil fungi dating from the Middle Ordovician until the Late Devonian periods, approximately 470 to 360 million years ago. Prototaxites formed small to large trunk-like structures up to 1 metre (3 ft) wide, reaching 8 metres (26 ft) in length,[1] made up of interwoven tubes around 50 micrometres (0.0020 in) in diameter, making it by far the largest land-dwelling organism of its time.

Whilst traditionally very difficult to assign to an extant group of organisms, current opinion suggests a fungal placement for the genus.[1] Its exact relationship with extant fungus lineages is uncertain. It was almost certainly a perennial organism that grew over multiple years. Several ecologies have been proposed, including that it was saprotrophic like many modern fungi, or that it was a lichenised autotroph.[2]

Bouillabaisse is a traditional Provençal fish stew originating in the port city of Marseille. The French and English form bouillabaisse comes from the Provençal Occitan word bolhabaissa, a compound that consists of the two verbs bolhir (to boil) and abaissar (to reduce heat, i.e., simmer).

Bouillabaisse was originally a stew made by Marseille fishers, using the bony rockfish which they were unable to sell to restaurants or markets. There are at least three kinds of fish in a traditional bouillabaisse, typically red rascasse (Scorpaena scrofa); sea robin; and European conger. It can also include gilt-head bream, turbot, monkfish, mullet, or European hake. It usually also includes shellf

A string figure is a design formed by manipulating string on, around, and using one's fingers or sometimes between the fingers of multiple people. String figures may also involve the use of the mouth, wrist, and feet. They may consist of singular images or be created and altered as a game, known as a string game, or as part of a story involving various figures made in sequence (string story). String figures have also been used for divination, such as to predict the sex of an unborn child.[1]

A popular string game is cat's cradle, but many string figures are known in many places under different names,[2] and string figures are well distributed throughout the world.[3][4][4][4]

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